Sewer-trap



(No Model.) Y

J. W. GRIFFIN.

SEWER TRAP.

No. 303,430. PatenteaAug. 12, 1334.

` Tiff( )A *VZ 6 E5 jl l' f- [Vg NrrEn STATES PATENT OFFICE..

l JOHN W. GRIFFIN, OF BUFFALO, NEW YORK.

SEWER-TRAP.

SPECIFICATION' forming part of Letters Patent No. 303,430, dated Augustl2, 188

Application med Feb'uary 1, 1884. (No model.)

To a/ZZ whom Azt may concern,.-

Be it known that I, JOHN WV.' GRIFFIN, of the city of Buffalo, in thecounty of Erie and State of New York, have -invented a new and usefulImprovement in Sewer-Traps, of which the following is a specification.

This invention relates to that class of sewertraps which are employedfor connecting cellar-drains with a sewer, and which consists of areceiver provided in its bottom with a suitable dischargeopening havinga raised mouth which is covered by an overhanging bell, whereby the trapis formed.

The object of my invention is to provide a simple and inexpensiveattachment to this class of sewer-traps, whereby the discharge-openingis readily closed against a pressure of backwater in the sewer, and itconsists of the improvements which will be hereinafter fully described,and pointed out in the claims.

In the accompanying drawings, Figure l is a sectional elevation of myimprov'ed trap. Fig. 2 is a bottom plan view thereof.

Like letters of reference refer to like parts in both iigures.

A represents the receiver, which may be of rectangular or other suitableform, and which preferably tapers downwardly and connects with the mouthof the drain leading to the sewer. B represents the dischargeopeningformed in the bottom of the receiver, and b the raised mouth thereof. Crepresents the bell or curved plate,which overhangs the elevated mouthof the dischargepipe and descends with its edge below said mouth asufficient distance to retain the level above the edge of the bell atsuch a height that the gas or air cannot pass from the discharge-pipeinto the receiver A. The bell C is secured to the under side of astrainer or perforated plate,y D, which forms a cover for the receivcrA. The cover D rests upon lugs or ears d, ca st on the inner side of thesidewalls of the receiver A.

F represents an annular ring or plate Suspended from the bottom of thereceiver A, be-

low the discharge-opening B, by means of screw-bolts or hangers g. rIhebolts g are inserted through holes formed in the bottom of the receiver,and their lower ends pass through holes formed in lugs f, which'extendlaterally from the annular ring or plate F. The ring F is secured to thebolts g' by screw-nuts g.

H represents a spherical or ball valve, which is seated in a depressionor valve-seat formed in the ring F, immediately below thedischargeopening B. The valve I-I is preferably made of rubber or othersuitable light material, so as to be buoyant and of sufficient strengthto resist the pressure of the back-water. In the event of any overflowor rush of back-water in the sewer the valve H is raised by the pressureof water and seats itself against the dis charge-opening B, and theflooding of water through the trap and into the cellar is therebyprevented.

The lower end of the discharge-opening B is preferably beveled orinclined, as shown at t', to form a close seat for the valve H.

I claim as my inventionl. The combination, with the receiver A, providedwith the discharge-opening B, of a ball-valve, H, seated in an annularplate, F,

arranged below the discharge-opening B, substantially as set forth.

2. The combination, with the receiver A, provided with thedischarge-opening B, having an elevated mouth, b, and bell C, of anannular ring or valve-seat, F, suspended from bottom of the receiver Aby bolts g and screwnuts g', and a ball-valve, H, seated in the annularring F below the discharge-opening B, substantially as and for thepurpose set forth.

Vitness my hand this 26th day of January, 1884.

JOHN XV. GRIFFIN.

Vitnesscs:

JNO. J. BONNFR, CHAs. F. GEYER.

